The Republican senator has been battling a recurrence of prostate cancer but said in a statement his decision to leave Congress early wasn’t due to his health.

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“Serving as Oklahoma’s senator has been, and continues to be, one of the great privileges and blessings of my life. But, after much prayer and consideration, I have decided that I will leave my Senate seat at the end of this Congress,” Coburn said in a statement late Thursday evening.

“Carolyn and I have been touched by the encouragement we’ve received from people across the state regarding my latest battle against cancer,” the senator said. “But this decision isn’t about my health, my prognosis or even my hopes and desires. My commitment to the people of Oklahoma has always been that I would serve no more than two terms. Our founders saw public service and politics as a calling rather than a career. That’s how I saw it when I first ran for office in 1994, and that’s how I still see it today. I believe it’s important to live under the laws I helped write, and even those I fought hard to block.

“As a citizen, I am now convinced that I can best serve my own children and grandchildren by shifting my focus elsewhere,” Coburn continued. “In the meantime, I look forward to finishing this year strong. I intend to continue our fight for Oklahoma, and will do everything in my power to force the Senate to re-embrace its heritage of debate, deliberation and consensus as we face our many challenges ahead.”

The now-open Senate seat, which should remain safely in Republican hands, is expected to draw interest from across the state’s congressional delegation and could produce several open House seats as well.

Inhofe, the state’s senior senator, praised Coburn’s congressional career in a statement.

“I was honored to help recruit Tom in 1993 to run for the House of Representatives. I knew then that he was an intellectual and superb medical doctor. As we worked together, I came to learn he also had the skills that made him arguably the most sought after adviser in the Republican conference. In every policy decision, Tom has sought to be a faithful steward of the taxpayers' money and a dedicated public servant to Oklahoma,” Inhofe said. “He is a true brother in the Lord and my prayers are with him and his family in this time."